San Diego already has a robust unmanned aircraft community. General Atomics Aeronautical Systems Inc. of Poway builds unmanned military aircraft and sensors here. Northrop Grumman centers its unmanned military aircraft business in Rancho Bernardo. Datron World Communications of Vista markets small drones to law enforcement. 3D Robotics of Kearny Mesa and Tijuana makes small drones, software and components; it sells to hobbyists and is researching business applications for drones.